new jersey governor chris christie last night was on with letterman for the first time. he says he has long admired letterman and doesn't mind all the fat jokes that letterman has endlessly made. >> i've made jokes about you, not just one or two, not just ongoing, here or there, intermittent, but -- >> i didn't know this was going to be this long. >> break for the donut because the interview was so long. >> i love it. >> he says, look, if the joke is funny, i laugh. even if it's about me. he pulled out a couple of jokes from dave's past shows and read them out loud. he defuses all this with humor. he is aware of the problem, as you talked about. >> a lot of us who struggle with weight feel that the best defense is an offense. you can laugh at yourself before others laugh at you, then you kind of take some of the sting out of it. >> interesting. barbara walters, you remember the interview she did last year when she asked if he was too fat to be president. he took issue with that. >> well, sure. that wasn't a joke. >> it wasn't a joke. >> and he says he's healthy. his bloo